Deep tillage plow

ABSTRACT

A plow which includes a V-shaped frame, a plurality of blade supporting brackets secured to the frame and spaced from each other therealong, an arcuate, forward sweep toothed blade secured to each of said brackets, and a pair of gauge wheel assemblies secured to the opposite ends of the frame. The gauge wheel assemblies are detachably mounted on the frame, and each includes a screw jack adjusting mechanism for raising and lowering the gauge wheels relative to the frame.

United States Patent 172] lnvcntor Ted L. Cline P. 0. Box 38. RushSprings, Okla. 73082 [21] AppLNo 729,358 [22] Filed May 15,1968 [45]Patented Feb. 2, 1971 [54] DEEP TILLAGE PLOW 5 Claims, 4 Drawing Figs.

[52] U.S.Cl l72/421 172/427; 280/432 [51] lnt.Cl ..'A01b63/l6 [50]FieldofSearch.... 172/419, 427, 421 429. 504, 690; 306/ l .5; 280/432[56] References Cited UNITED STATES PATENTS 2,269,519 1/1942 Christenson172/427X 1,346,432 7/1920 Towner 172/504X 1,784,193 12/1930 McOskerl72/419X 2.304.383 12/1942 Strandlund 172/419X 3,077,231 2/1963 Hamilton172/421 3,403,737 10/1968 Byrd 172/427X FOREIGN PATENTS 686.719 7/1930France 172/427 Primary Examiner-Robert E. Pulfrey AssistantExaminer-Stephen G. Pellegrino AttorneyDunlap, Laney, Hessin & DoughertyABSTRACT: A plow which includes a V-shaped frame, a plurality of bladesupporting brackets secured to the frame and spaced from each othertherealong, an arcuate, forward sweep toothed blade secured to each ofsaid brackets, and a pair of gauge wheel assemblies secured to theopposite ends of the frame. The gauge wheel assemblies are detachablymounted on the frame, and each includes a screw jack adjusting mechanismfor raising and lowering the gauge wheels relative to the frame.

PATENTED FEB 2 I97! INVENTOR. 75-0 La CL/k/E f LET-IE DEEP TILLAGE PLOWBACKGROUND OF THE INVENTION 1. Field of the Invention This inventionrelates to deep tillage or subsoiler type plows. and more particularly,to deep tillage plows having gauge wheels which can be adjusted in theirrelationship to the frame of the plow to control the depth to which theplow blades or tines penetrate the earth.

2. Brief Description of the Prior Art For many years, the types of plowswhich were available for agricultural purposes included only relativelylight turning plows which were utilized for the purpose of penetratingthe topsoil and opening a furrow through a fairly shallow layer of thesoil. In more recent years, the size of farm tractors has increasedsignificantly as has the power of these machines. Consequently, it isnow possible for these larger tractors to successfully pull heavierplows which have large arcuate sweep teeth or blades secured thereonwhich are capable of penetrating the subsoil to a considerable depth.Several plows of this type have been recently manufactured andsuccessfully marketed. These plows, when used in conjunction with themore highly powered tractors, permit deep plowing and bedding to beaccomplished in a single operation, and permit the breaking up of virginsubsoil, and the achievement of greater moisture retention in the soil.

It is desirable in deep tillage or subsoiling plows of this type thatsome means be provided for adjusting the depth to which the plow bladesor tines will penetrate the soil. While lighter equipment can veryfrequently be adequately adjusted in plowing depth by manipulation ofthe hitch connections to the towing tractor, some of the subsoilingplows presently marketed are quite heavy, and this type of adjustment ofdepth is not an entirely satisfactory answer to this need. Accordingly,it has been proposed to provide gauge wheels on these plows for thepurpose of permitting the relationship of the plow frame to the groundto be varied. Thus, as the gauge wheels contact and move along theground, their spatial relationship with respect to the plow frame uponwhich they are mounted determines the position of the frame relative tothe ground, and con sequently determines ultimately the depth to whichthe blades of the plow will penetrate the earth.

Various arrangements have been made for permitting the gauge wheels tobe adjusted relative to their position on the frame. In some cases, avery simple construction has been employed in which the gauge wheels aresimply unbolted from one point of securement on the frame, and thenrebolted to another point of securement to the frame. Thoughmechanically simple, and an inexpensive way of providing for such gaugewheel adjustment, this method obviously is time-consuming in practice,and entails an undesirable amount of physical exertion on the part ofthe farmer.

Other constructions which have been proposed for permitting gauge wheeladjustment include relatively complicated mechanisms which employcranks, levers and the like for permitting either one or a plurality ofthe gauge wheels to be adjusted in its position on the frame, either bylocal adjustment at the frame or by remote adjustment from the tractor.In general, these mechanisms are relatively complicated and expensive,and because of their mechanical complexity, tend frequently to becomejammed, or to bind, or to develop a mechanical malfunction which rendersthe entire tractor inoperative or, less seriously, prevents furthergauge wheel adjustment until extensive repairs are effected.

BRIEF DESCRIPTION OF THE PRESENT INVENTION This invention provides animproved deep tillage or subsoiler plow which carries heavy gauge wheelson theplow frame and includes mechanism for quickly and easily adjustingthe position of the gauge wheels in relation to the frame. Broadlydescribed, the deep tillage plow of the invention includes an elongatedV-shaped frame which carries over its length a plurality of spaced bladesupporting brackets. The blade supporting brackets each have detachablysecured thereto an arcuate, forward sweep tooth blade.

Secured to the opposite end portions of the V-shaped frame are a pair ofgauge wheel assemblies. These assemblies are detachably mounted on theframe, and each includes a screw jack adjusting mechanism for raisingand lowering the gauge wheels relative to the frame. Each screw jackadjusting mechanism includes a wheel supporting arm which carries at oneof its ends, a wheel mounting axle, and at its other end, a sleeve whichis pivotally secured in a mounting bracket secured to the frame. Eachgauge wheel adjusting assembly also includes a threaded shaft sleevewhich is pivotally secured to the upper side of the wheel supporting armfor pivotation about a horizontal axis, and which threadedly receivesthe lower end of a threaded shaft. The threaded shaft is mounted forrotation about a vertical axis in a shaft collar disposed near the upperend of the threaded shaft. The shaft collar is pivotally mounted througha shaft collar bracket to the frame of the plow. A handle or othersuitable means of rotating the threaded shaft is provided at the upperend of this shaft on the opposite side of the shaft collar from thethreaded lower end of the shaft which extends into the threaded shaftsleeve.

The described structure permits the gauge wheels mounted on the plowframe to be quickly and easily adjusted in their positions relative tothe frame of the plow, so that the teeth of the plow can be made topenetrate the earth to any depth desired. Thus, a major object of theinvention of providing a versatile deep tillage plow which can be usedfor plowing to various depths is achieved.

An additional object achieved by the invention is the provision of adeep tillage or subsoiling plow which carries sets of heavy duty gaugewheels which may be easily manipulated in their relationship to the plowframe so as to preset the depth to which the plow blades will penetratethe earth.

A further object of the invention is to provide a simple gauge wheeladjusting mechanism for use in conjunction with the gauge wheels of adeep tillage plow, which mechanism is mechanically rugged andcharacterized in having a long and trouble free operating life.

An additional and more specific object of the invention is to provide agauge wheel adjustment mechanism for use on deep tillage plows carryinggauge wheels, which mechanism can be easily utilized by a single personemploying a single hand for adjusting the gauge wheels.

In addition to the described objects and advantages, additional objectsand advantages will become apparent as the following detaileddescription of the invention is read in conjunction with theaccompanying drawings which illustrate the invention.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a deeptillage plow constructed in accordance with the present invention.

FIG. 2 is a front elevational view of the plow illustrated in FIG. 1.

FIG. 3 is an end elevation view of the plow depicted in FIGS. 1 and 2illustrating the plow as it appears when viewed from one of the ends ofthe framework carrying one of the gauge wheel assemblies.

FIG. 4 is a sectional view taken along line 4-4 of FIG. 1.

DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTIONReferring initially to the drawings, and particularly to FIG. 1, thedeep tillage plow of the invention includes a V-shaped frame designatedgenerally by reference numeral 10. The V- shaped frame 10 includes apair of arms 12. The arms 12 define an obtuse angle between them andintersect at a medial point or apex l4. Secured to the upper side ofeach of the arms 12 of the V-shaped plow 14 are a plurality ofhorizontally spaced blade supporting brackets 16. Each of the bladesupporting brackets 16 includes a pair of parallel plates 18 whichextend rearwardly from the V-shaped frame 10. A plurality of bolts 20are extended through the plates 18 to secure the upper end portion of aforwardly swept plow blade or tine 22 in each of the blade supportingbrackets 16. Each of the plow blades 22 carries at its lower, forwardend, a hardened wear shoe 24. The configuration of the forwardly sweptblades or tines 22 can be best perceived by referring to FlGS. 24 of thedrawings.

As has been previously explained, the deep tillage plow of the inventionis utilized by connecting it behind a tractor or similar towing vehicle.As is conventional practice, the plow is constructed to facilitateconnection to a three-point connection or hitch of the type commonlyused on agricultural tractors, To this end, the pair of outer hitchbrackets designated generally by reference numeral 26 are secured to theupper side of the bars 12 at an outwardly spaced position from the apex14 of the frame 10. The outer hitch brackets 26 each include a pair ofparallel plates 28 which are apertured to receive a suitable hitch pin(not shown). A central hitch bracket 30 is secured to the frame 10 atthe apex 14 and includes a pair of vertically extending parallel plateshaving aligned apertures in their upper portions to facilitate connec'tion of the hitch bracket 30 to the center hitch of a three-pointconnection assembly on the tractor.

Secured to the free ends of each of the bars 12, or stated differently,at the opposite ends of the V-shaped frame 10, are a pair of gauge wheelassemblies designated generally by reference numeral 34. Each of thegauge wheel assemblies 34 includes a mounting bracket which comprises arelatively large end plate 36 which is secured by bolts 38 or othersuitable means to the ends of the bars 12 of the frame 10. The endplates 36 of each gauge wheel assembly 34 are welded at a right angle toa face plate 40 which is welded to a diagonal plate 42 along its edgeopposite the edge secured to the end plate 36. Each diagonal plate 42 isbolted to a bracket plate 44 which is welded to the respective arm 12 ofthe frame 10 at a location spaced inwardly from the end of the arm. Itwill thus be seen that the gauge wheel assemblies 34 can be quicklyattached and detached from the frame 10 as may be desired.

Welded or otherwise suitably secured to the forward face of each faceplate 40 are a pair of parallel brace plates 46. Each of the pairs ofbrace plates 46 has secured across the upper edges thereof, a cap plate48 and receive at the free or unwelded forward edges, a transverselyextending pivot pin 50. The pivot pin 50 passes through and journals asleeve 52 positioned between the brace plates 46. The sleeve 52 isrotatable about the axis of the pivot pin. The sleeve 52 is secured to ashaft collar 54 having a vertically extending bore therethrough androtatably joumaling the upper end of an adjustment shaft 56 which isthreaded at its lower end. At its upper end, each of the adjustmentshafts 56 carries a flange 57 which rides on the top of the respectiveshaft collar 54 and is secured to a hand crank 59. The portion of eachshaft 56 between the flange 57 and the threads thereon is necked down toa reduced diameter to allow the upper end of each shaft to be extendedthrough the respective collar 54 before the respective flange 57 iswelded in place. This construction prevents axial movement of each shaft56 in its respective collar. The lower end of each threaded nut 58 whichis welded to the upper end of a shaft sleeve 60 which receives the lowerend of the threaded shaft. The shaft sleeve 60 is pivotally connected toa sleeve bracket 62 by means of a suitable horizontally extending pivotpin 64.

Each sleeve bracket 62 is welded to the upper side of an elongated wheelsupporting arm 66. Each of the wheel supporting arms 66 is pivotallyjoumaled on a horizontally FIGS. pivot pin 68 which extends between apair of parallel plates 70 forming an arm bracket designated generallyby reference numetal 72. The parallel plates 70 of each arm bracket 72are welded to the face plate 40 of the respective gauge wheel assembly34. At their ends opposite the ends joumaled in the arm brackets 72,each of the wheel supporting arms 66 extends between a pair of groundengaging gauge wheels 74. The

gauge wheels 74 are joumaled on axles 76 which extend from the oppositesides of each wheel supporting arm 66 as best illustrated in 22 1 and 2.

OPERATION In the use of the deep tillage plow ofthe invention, the outerhitch brackets 26 are connected to the outer connections of thethree-point hookup connection of an agricultural tractor. The centralhitch bracket 30 is connected to the central connection of thethree-point hookup. Either prior to or after this time, the gauge wheelassemblies 34 are secured in position by bolting the end plates 36 ofthe gauge wheel assemblies to the ends of the bars 12 of the V-shapedframe 10 with suitable bolts 38, and by bolting the diagonal plates 42to the bracket plates 44 spaced inwardly from the end of the bars 12 ofthe frame 10. The position of the gauge wheels 74 with respect to theframe 10 can then be adjusted by means of the screw jack adjustingmechanism hereinbefore described.

As the hand crank 59 is rotated, the threaded portion of the adjustmentshaft 56 is threaded further into or 'out of the threaded nut 58. Theresult of this movement of the shaft 56 is to force the shaft sleeve 60and the threaded nut 58 toward or away from the shaft collar 54,depending upon the direction of rotational movement of the hand crank59. in H6. 3 of the drawings, a position of the gauge wheels isillustrated in which the shaft sleeve 60 has been forced downwardly awayfrom the shaft collar 54. This movement causes the shaft sleeve 60 topivot about the pivot pin 64 which pivotally connects it to the sleevebracket 62. At the same time, the sleeve bracket 62 and the wheelsupporting arm 66 is forced downwardly so that the wheel supporting armpivots about the pivot pin 68 which pivotally supports it in theparallel plates 70 of the arm bracket 72. This pivotal movement of thewheel supporting arm 66 depresses the outer end of the arm and moves thegauge wheels 74 downwardly with respect to the frame 10.

If it should be desired to elevate the gauge wheels 74 relative to theV-shaped frame 10, this is accomplished by rotating the hand crank 59ina direction which will screw the threaded portion of the adjustmentshaft 56 into the threaded nut 58. This draws the shaft sleeve 60upwardly to, in turn, draw the wheel supporting arm 66 upwardly aboutits horizontal pivotal axis in the pivot pin 68.

It will be perceived that, by manipulation of the hand crank 59associated with each of the gauge wheel assemblies 34, the gauge wheel74 located at the opposite ends of the V-shaped frame 10 can beindependently adjusted in their vertical relationship to the frame 10.It should also be pointed out that the gauge wheel assemblies 34 can bequickly attached or detached from the arms 12 of the V-shaped frame sothat the deep tillage plow can be allowed to penetrate the soil to themaximum depth which it is capable of attaining, if this mode ofoperation should be desirable in any situation. Moreover, the quickdetachable characteristic of the gauge wheel assemblies 34 permits themto be quickly removed from the frame 10 in the event maintenance isrequired which cannot be locally performed.

From the foregoing description of the invention, it is believed that itwill be apparent that the structure of the deep tillage plow of theinvention permits versatile operation of the plow and adjustment of thedepth to which the forward sweep tooth blades 22 will be permitted topenetrate the soil. Moreover, adjustment of the gauge wheels can beaccomplished manually with a single hand, and the relative simplicityand mechanical reliability of the mechanism employed avoids thenecessity for frequent or expensive repairs.

Although a preferred embodiment of the invention has been illustrated inthe accompanying drawings and described in the foregoing specification,it will be understood that various changes and modifications can beeffected in the described and depicted structure without departure fromthe basic principles which underlie the invention. All changes andinnovations of this type which continue to rely on these principles aretherefore deemed to be circumscribed by the spirit and scope of theinvention except as the same may be necessarily limited by the appendedclaims or reasonable equivalents thereof. t

I claim:

1. A deep tillage plow comprising:

a horizontally extending V-shaped frame having a pair of free ends anddefining an angle at the central portion thereof;

a plurality of spaced plow blades detachably secured to said frame andextending downwardly therefrom; and

a pair of gauge wheel assemblies detachably mounted on the frame at theopposite ends thereof, each of said gauge wheel assemblies comprising:an end plate secured to one of the free ends of the frame; a diagonalplate secured to the frame intermediate said central portion of theframe and said one free end thereof;

a face plate secured between said diagonal plate and said end plate;

parallel plate means projecting from said face plate;

a shaft collar pivotally secured between said parallel plate means forpivotation about a horizontal axis;

an elongated wheel supporting arm having a first end and having a secondend pivotally secured to said mounting bracket means for pivotationabout a horizontal axis spaced downwardly from the horizontal pivotalaxis of said shaft collar;

a ground engaging wheel rotatably joumaled on the first end of saidwheel supporting arm;

sleeve means pivotally secured to said wheel supporting arm between theends thereof for pivotation about a horizontal axis;

elongated shaft means extending through and joumaled in said shaftcollar and extending to and engaging said sleeve means; and

means changing the axial spacing of said shaft collar relative to saidsleeve means along the axis of said shaft means as said shaft means isrotated about its longitudinal axis.

2. A deep tillage plow comprising:

a horizontally extending V-shaped frame having a pair of free ends anddefining an angle at the central portion thereof;

a plurality of spaced plow blades detachably secured to said frame andextending downwardly therefrom; and

a pair of gauge wheel assemblies detachably mounted on the frame atopposite ends thereof, each of said gauge wheel assemblies comprising:mounting bracket means detachably secured to said frame and comprising:

an endplate secured to one of the free ends of the frame;

a diagonal plate secured to said frame intermediate said central portionof said frame and said one free end thereof;

a face plate secured between the diagonal plate and said endplate;

a pair of parallel, vertically extending brace plates projecting fromsaid faceplate on the opposite side thereof from said frame; and

a pair of parallel, vertically extending arm bracket plates projectingfrom said faceplate below said brace plates;

a shaft collar pivotally secured between said brace plates forpivotation about a horizontal axis;

an elongated wheel supporting arm having a first end and having a secondend pivotally secured between said arm bracket means for pivotationabout a horizontal axis spaced downwardly from the horizontal pivotalaxis of said shaft collar;

a ground engaging wheel rotatably joumaled on the first end of saidwheel supporting arm;

sleeve means pivotally secured to said wheel supporting arm between theends thereof for pivotation about a horizontal axis;

elongated shaft means extending through and joumaled in said shaftcollar and extending to and engaging said sleeve means;

threads on said shaft means; and

threads on said sleeve means threadedly engaging the threads on saidshaft means.

3. A deep tillage plow comprising:

a horizontally extending frame having a pair of free outer ends;

a plurality of spaced plow blades secured to said frame and extendingdownwardly therefrom; and

a pair of gauge wheel assemblies detachably mounted on the frame at theopposite free ends thereof. each of said gauge wheel assembliescomprising:

mounting bracket means detachably secured to said frame and comprising:

a plate detachably secured to one of the free ends of the frame; and

a pair of parallel plates projecting forwardly with respect to theframe;

a shaft collar pivotally secured between said parallel plates forpivotation about a horizontal axis;

an elongated wheel supporting arrn having a first end and having asecond end pivotally secured to said mounting bracket means forpivotation about a horizontal axis spaced downwardly from the horizontalpivotal axis of said shaft collar;

a ground engaging wheel rotatably joumaled on the first end of saidwheel supporting arm;

a sleeve pivotally secured to said wheel supporting arm between the endsthereof for pivotation about a horizontal axis;

an elongated threaded shaft extending through and journaled in saidshaft collar;

a flange around the outside of said shaft and bearing against the upperside of said shaft collar for preventing said shaft from movingdownwardly therethrough; and

a threaded nut secured to an upper end of said sleeve and having theopening therethrough aligned with the bore through said sleeve, said nutthreadedly engaging the lower end of said threaded shaft; and

means for rotating said threaded shaft secured to the upper end thereof.

4. A deep tillage plow comprising:

a horizontally extending frame having a pair of free outer ends;

a plurality of spaced plow blades mounted on said frame and extendingdownwardly therefrom; and

a pair of gauge wheel assemblies mounted on the frame adjacent theopposite free ends thereof, each of said gauge wheel assembliescomprising:

mounting bracket means detachably secured to said frame and includingparallel plates projecting forwardly with respect to the frame;

a shaft collar pivotally secured to said parallel plates for pivotationabout a horizontal axis;

an elongated wheel supporting arm having a first end and having a secondend pivotally secured to said mounting bracket means for pivotationabout a horizontal axis spaced downwardly from the horizontal pivotalaxis of said shaft collar;

a ground engaging wheel rotatably joumaled on the first end of saidwheel supporting arm;

sleeve means pivotally secured to said wheel supporting arm between theends thereof for pivotation about a horizontal axis;

an elongated threaded shaft extending through and journaled in saidshaft collar and extending to and engaging said sleeve means;

means on the outside of said shaft and bearing against the upper side ofsaid shaft collar for preventing said shaft from moving downwardlytherethrough; and

means for rotating said threaded shaft secured to the upper end thereof.5. A deep tillage plow comprising: a horizontally extending V-shapedframe having a pair of free ends and defining an angle at the centralportion thereof; a plurality of spaced arcuate plow blades mounted onsaid frame and extending downwardly therefrom; and a pair of gauge wheelassemblies detachably mounted on the frame at the opposite ends thereof,each of said gauge wheel assemblies comprising: mounting bracket meansdetachably secured to said frame and including parallel platesprojecting forwardly with respect to said frame;

a shaft collar pivotally secured to said parallel plates for pivotationabout a horizontal axis;

an elongated wheel supporting arm having a first end and having a secondend pivotally secured to said mounting bracket means for pivotationabout a horizontal axis spaced downwardly from the horizontal pivotalaxis of said shaft collar;

a ground engaging wheel rotatably journaled on the first end of saidwheel supporting arm;

sleeve means pivotally secured to said wheel supporting arm between theends thereof for pivotation about a horizontal axis and having threadsthereon;

an elongated shaft having threads thereon and extending through andjournaled in said shaft collar, and extending to, and engaged by thethreads thereon to, the threads on said sleeve means;

a flange on the outside of said shaft and bearing against the upper sideof said shaft collar limiting movement of said shaft means through saidcollar in the direction of said sleeve means; and

a hand crank positioned on the opposite side of said collar from saidsleeve means.

1. A deep tillage plow comprising: a horizontally extending V-shapedframe having a pair of free ends and defining an angle at the centralportion thereof; a plurality of spaced plow blades detachably secured tosaid frame and extending downwardly therefrom; and a pair of gauge wheelassemblies detachably mounted on the frame at the opposite ends thereof,each of said gauge wheel assemblies comprising: an end plate secured toone of the free ends of the frame; a diagonal plate secured to the frameintermediate said central portion of the frame and said one free endthereof; a face plate secured between said diagonal plate and said endplate; parallel plate means projecting from said face plate; a shaftcollar pivotally secured between said parallel plate means forpivotation about a horizontal axis; an elongated wheel supporting armhaving a first end and having a second end pivotally secured to saidmounting bracket means for pivotation about a horizontal axis spaceddownwardly from the horizontal pivotal axis of said shaft collar; aground engaging wheel rotatably journaled on the first end of said wheelsupporting arm; sleeve means pivotally secured to said wheel supportingarm between the ends thereof for pivotation about a horizontal axis;elongated shaft means extending through and journaled in said shaftcollar and extending to and engaging said sleeve means; and meanschanging the axial spacing of said shaft collar relative to said sleevemeans along the axis of said shaft means as said shaft means is rotatedabout its longitudinal axis.
 2. A deep tillage plow comprising: ahorizontally extending V-shaped frame having a pair of free ends anddefining an angle at the central portion thereof; a plurality of spacedplow blades detachably secured to said frame and extending downwardlytherefrom; and a pair of gauge wheel assemblies detachably mounted onthe frame at opposite ends thereof, each of said gauge wheel assembliescomprising: mounting bracket means detachably secured to said frame andcomprising: an endplate secured to one of the free ends of the frame; adiagonal plate secured to said frame iNtermediate said central portionof said frame and said one free end thereof; a face plate securedbetween the diagonal plate and said endplate; a pair of parallel,vertically extending brace plates projecting from said faceplate on theopposite side thereof from said frame; and a pair of parallel,vertically extending arm bracket plates projecting from said faceplatebelow said brace plates; a shaft collar pivotally secured between saidbrace plates for pivotation about a horizontal axis; an elongated wheelsupporting arm having a first end and having a second end pivotallysecured between said arm bracket means for pivotation about a horizontalaxis spaced downwardly from the horizontal pivotal axis of said shaftcollar; a ground engaging wheel rotatably journaled on the first end ofsaid wheel supporting arm; sleeve means pivotally secured to said wheelsupporting arm between the ends thereof for pivotation about ahorizontal axis; elongated shaft means extending through and journaledin said shaft collar and extending to and engaging said sleeve means;threads on said shaft means; and threads on said sleeve means threadedlyengaging the threads on said shaft means.
 3. A deep tillage plowcomprising: a horizontally extending frame having a pair of free outerends; a plurality of spaced plow blades secured to said frame andextending downwardly therefrom; and a pair of gauge wheel assembliesdetachably mounted on the frame at the opposite free ends thereof, eachof said gauge wheel assemblies comprising: mounting bracket meansdetachably secured to said frame and comprising: a plate detachablysecured to one of the free ends of the frame; and a pair of parallelplates projecting forwardly with respect to the frame; a shaft collarpivotally secured between said parallel plates for pivotation about ahorizontal axis; an elongated wheel supporting arm having a first endand having a second end pivotally secured to said mounting bracket meansfor pivotation about a horizontal axis spaced downwardly from thehorizontal pivotal axis of said shaft collar; a ground engaging wheelrotatably journaled on the first end of said wheel supporting arm; asleeve pivotally secured to said wheel supporting arm between the endsthereof for pivotation about a horizontal axis; an elongated threadedshaft extending through and journaled in said shaft collar; a flangearound the outside of said shaft and bearing against the upper side ofsaid shaft collar for preventing said shaft from moving downwardlytherethrough; and a threaded nut secured to an upper end of said sleeveand having the opening therethrough aligned with the bore through saidsleeve, said nut threadedly engaging the lower end of said threadedshaft; and means for rotating said threaded shaft secured to the upperend thereof.
 4. A deep tillage plow comprising: a horizontally extendingframe having a pair of free outer ends; a plurality of spaced plowblades mounted on said frame and extending downwardly therefrom; and apair of gauge wheel assemblies mounted on the frame adjacent theopposite free ends thereof, each of said gauge wheel assembliescomprising: mounting bracket means detachably secured to said frame andincluding parallel plates projecting forwardly with respect to theframe; a shaft collar pivotally secured to said parallel plates forpivotation about a horizontal axis; an elongated wheel supporting armhaving a first end and having a second end pivotally secured to saidmounting bracket means for pivotation about a horizontal axis spaceddownwardly from the horizontal pivotal axis of said shaft collar; aground engaging wheel rotatably journaled on the first end of said wheelsupporting arm; sleeve means pivotally secured to said wheel supportingarm between the ends thereof for pivotation about a horizontal axis; anelongated threaded shaft extEnding through and journaled in said shaftcollar and extending to and engaging said sleeve means; means on theoutside of said shaft and bearing against the upper side of said shaftcollar for preventing said shaft from moving downwardly therethrough;and means for rotating said threaded shaft secured to the upper endthereof.
 5. A deep tillage plow comprising: a horizontally extendingV-shaped frame having a pair of free ends and defining an angle at thecentral portion thereof; a plurality of spaced arcuate plow bladesmounted on said frame and extending downwardly therefrom; and a pair ofgauge wheel assemblies detachably mounted on the frame at the oppositeends thereof, each of said gauge wheel assemblies comprising: mountingbracket means detachably secured to said frame and including parallelplates projecting forwardly with respect to said frame; a shaft collarpivotally secured to said parallel plates for pivotation about ahorizontal axis; an elongated wheel supporting arm having a first endand having a second end pivotally secured to said mounting bracket meansfor pivotation about a horizontal axis spaced downwardly from thehorizontal pivotal axis of said shaft collar; a ground engaging wheelrotatably journaled on the first end of said wheel supporting arm;sleeve means pivotally secured to said wheel supporting arm between theends thereof for pivotation about a horizontal axis and having threadsthereon; an elongated shaft having threads thereon and extending throughand journaled in said shaft collar, and extending to, and engaged by thethreads thereon to, the threads on said sleeve means; a flange on theoutside of said shaft and bearing against the upper side of said shaftcollar limiting movement of said shaft means through said collar in thedirection of said sleeve means; and a hand crank positioned on theopposite side of said collar from said sleeve means.